I have a 226 in a '51 car. I've driven it for 15 years. It has a Nicson Engineering 2x1 intake manifold....the only one I have ever seen. I have had the best luck running square bowl Holley single barrel carbs from a '56 Ford truck. Nielson Cams (somewhere in Utah, they used to advertise in Hemmings) ground my stock cam to a 3/4 flathead grind. The cam worked out ok except lifter noise increased considerably, I guess due to the lift. I modified a car exhaust manifold by blocking the center and adding a truck outlet for the front three cylinders.